You are right to think that <£30 is being optimistic. You should not skimp out on a PSU. It has to power your entire system and going for a cheap one could lead to other components being destroyed in the long term (it does happen). The way I see it is that the PSU is the most fundamental component in the system; you'd get nowhere without one.

For that system, an OCZ StealthXStream 500W should fare just fine and you'll be able to get it for around £52 shipped. This really is the lowest I'd go. It's on sale this week only at OcUK so I'd get it while it's hot.Edited by jNSK - 1/18/11 at 6:36am

You can find a good cheap unit if you look around enough.I know england is different but the corsair 430 was 15 bucks after rebate here.That is a good cheap unit.I also bought a 500 watt modular antec for 30.00 a few months ago.So contrary to popular belief good cheap units are out there.